Summertime Transport Pathways From Different Northern Hemisphere Regions Into the Arctic
Summertime Transport Pathways From Different Northern Hemisphere Regions Into the Arctic
复制标题
夏季从北半球不同地区进入北极的运输路径
DOI：
10.1029/2020jd033811
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Tilmes, Simone
中科院分区：
文献类型：
--
作者：
Zheng, Cheng;Wu, Yutian;Ting, Mingfang;Orbe, Clara;Wang, Xinyue;Tilmes, Simone
微量气体和气溶胶在北极化学和气候中起着重要作用。由于大多数北极示踪剂和气溶胶都是从中纬度源区输送来的，因此，远距离输送到北极是了解北极气候当前和未来状况的关键因素之一。虽然之前的研究已经调查了北极的气团比例和过境时间分布，但实际的传输路径及其潜在的动态和效率尚未得到了解。在这项研究中，我们实现了一个大的理想化的标签脉冲被动示踪剂在全大气社区气候模式版本5识别和分析夏季传输路径从不同的北方半球表面区域到北极。三种不同的传输途径被确定为与快速，中间和缓慢的时间尺度。中纬度示踪剂在对流层中可以通过快速输送通道（108天）输送到北极，该通道主要通过瞬变涡旋将示踪剂从源区向北输送。在1-3周的中间输送路径中，中纬度示踪剂首先被急流输送，然后向北平流进入阿拉斯加和北大西洋北方的北极地区。热带和亚热带示踪剂通过缓慢输送路径（1-3个月）输送到北极平流层下部，示踪剂被抬升到热带和亚热带平流层下部，然后沿等熵面输送到北极。
Trace gases and aerosols play an important role in Arctic chemistry and climate. As most Arctic tracers and aerosols are transported from midlatitude source regions, long‐range transport into the Arctic is one of the key factors to understand the current and future states of Arctic climate. While previous studies have investigated the airmass fraction and transit time distribution in the Arctic, the actual transport pathways and their underlying dynamics and efficiencies are yet to be understood. In this study, we implement a large ensemble of idealized tagged pulse passive tracers in the Whole Atmosphere Community Climate Model version 5 to identify and analyze summertime transport pathways from different Northern Hemisphere surface regions into the Arctic. Three different transport pathways are identified as those associated with fast, intermediate and slow time scales. Midlatitude tracers can be transported into the Arctic in the troposphere via the fast transport pathway (∼8 days), which moves tracers northward from the source region mainly through transient eddies. For the intermediate transport pathway, which happens on 1–3 weeks’ time scales, midlatitude tracers are first zonally transported by the jet stream, and then advected northward into the Arctic over Alaska and northern North Atlantic. Tropical and subtropical tracers are transported into the Arctic lower stratosphere via the slow transport pathway (1–3 months), as the tracers are lifted upward into the tropical and subtropical lower stratosphere, and then transported into the Arctic following the isentropic surfaces.
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发表时间：
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